html{
  width: 100%;
  height: 100%;
  overflow: hidden;
  body{
    width: 100%;
    height: 100%;
    overflow: hidden;
    #app{
      width: 100%;
      height: 100%;
      overflow: hidden;
      position: relative;
      #test{
        width: 300px;
        height: 300px;
        background: url("../img/zdy.jpg") no-repeat;
        background-size: 100% 100%;
        position:absolute ;
        left: 0;
        right: 0;
        top: 0;
        bottom: 0;
        margin: auto;

        display: flex;
        .item{
          flex: 1;
        }
      }
      .qhf{
        font-size: 100px;
        color: pink;
      }
    }
  }
}